LUCRĂRI ŞTIINŢIFICE, SERIA HORTICULTURĂ, 63 (1) / 2020, USAMV IAŞI PALYNOLOGICAL FEATURES AND POLLEN GERMINATION POTENTIAL IN HYACINTHUS ORIENTALIS L. PARTICULARITĂŢILE PALINOLOGICE ŞI POTENŢIALUL GERMINATIV AL POLENULUI DE HYACINTHUS ORIENTALIS L. PĂDUREANU Silvica1 *Corresponding author e-mail:
[email protected] Abstract. Palynology is a field of research on pollen and plant spores. Pollen research provides phylogenetic evidence in plant systematics. In this study are reported the main palynological features of a genotype known in the culture of ornamental plants, namely Hyacinthus orientalis. Respective palynological determinations concerned: shape, color of pollen grains, ornamentation of exine, size of pollen grains, number of germination pores/pollen grain. In connection with these determinations, the germination potential was tested on nutrient mediums with different carbohydrate compositions. In this regard, the effects of sucrose and glucose in different concentrations on pollen germination rates were investigated. Hyacinthus orientalis pollen has been shown to prefer 15% sucrose, when percentage of germinated grains was 95%, a percentage that is maintained for the next 96 hours. Glucose were suboptimal for pollen of this genotype. The results of this experiment provide useful information in taxonomy of genus Hyacinthus and in ornamental plant breeding. Key words: Hyacinthus orientalis, pollen grain, nutritive medium, pollen germination Rezumat. Palinologia este domeniul de cercetare al polenului şi sporilor plantelor. Cercetările asupra polenului furnizează dovezi filogenetice în sistematica plantelor. În prezentul studiu sunt relatate principalele particularităţi palinologice ale unui genotip cunoscut în cultura plantelor ornamentale, şi anume Hyacinthus orientalis. Respectivele determinări palinologice au vizat: forma, culoarea granulelor polinice, ornamentaţia exinei, dimensiunea granulelor de polen, numărul porilor germinativi/granulă de polen.